STM32F103CBT6

{
  "schema_version": 1,
  "type": "component",
  "slug": "stm32f103cbt6",
  "title": "STM32F103CBT6",
  "brief": "STMicroelectronics Microcontrollers (MCU/MPU/SOC), LQFP-48(7x7). Pinout checked against ST's open pin data, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "mcu",
    "stm32f103cbt6"
  ],
  "component": {
    "mpn": "STM32F103CBT6",
    "manufacturer": "STMicroelectronics",
    "package": "LQFP-48(7x7)",
    "pin_count": 48,
    "category": "MCU",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://www.st.com/resource/en/datasheet/stm32f103cbt6.pdf",
    "parts": {
      "symbol": "stm32f103cbt6.kicad_sym",
      "footprint": "stm32f103cbt6.kicad_mod",
      "model_3d": "stm32f103cbt6-etched.glb",
      "model_3d_plain": "stm32f103cbt6.glb",
      "model_3d_step": "stm32f103cbt6-etched.step",
      "model_3d_step_plain": "stm32f103cbt6.step",
      "lbr": "stm32f103cbt6.lbr"
    },
    "distributor_links": {
      "digikey": "497-6288-ND",
      "lcsc": "C8304"
    },
    "pins": [
      {
        "number": "1",
        "name": "VBAT",
        "type": "power_in",
        "description": "Backup battery supply, 1.8 V to 3.6 V. Powers the RTC, LSE oscillator and backup registers when VDD is off."
      },
      {
        "number": "2",
        "name": "PC13-TAMPER-RTC",
        "type": "bidirectional",
        "description": "GPIO PC13 with alternate function TAMPER input / RTC calibration output. Supplied through the backup power switch (limited to 3 mA, ≤2 MHz, ≤30 pF)."
      },
      {
        "number": "3",
        "name": "PC14-OSC32_IN",
        "type": "bidirectional",
        "description": "GPIO PC14; alternate function LSE 32.768 kHz oscillator input (OSC32_IN). Backup-domain supply, limited drive when used as GPIO."
      },
      {
        "number": "4",
        "name": "PC15-OSC32_OUT",
        "type": "bidirectional",
        "description": "GPIO PC15; alternate function LSE 32.768 kHz oscillator output (OSC32_OUT). Backup-domain supply, limited drive when used as GPIO."
      },
      {
        "number": "5",
        "name": "PD0-OSC_IN",
        "type": "bidirectional",
        "description": "Configured as OSC_IN (HSE crystal input) after reset. Can be remapped as GPIO PD0 (limited to 50 MHz in output)."
      },
      {
        "number": "6",
        "name": "PD1-OSC_OUT",
        "type": "bidirectional",
        "description": "Configured as OSC_OUT (HSE crystal output) after reset. Can be remapped as GPIO PD1 (limited to 50 MHz in output)."
      },
      {
        "number": "7",
        "name": "NRST",
        "type": "bidirectional",
        "description": "Bidirectional device reset (active low). Internal pull-up; asserted by internal reset sources."
      },
      {
        "number": "8",
        "name": "VSSA",
        "type": "power_in",
        "description": "Analog ground reference for the ADC and analog blocks. Tie to system ground with proper decoupling."
      },
      {
        "number": "9",
        "name": "VDDA",
        "type": "power_in",
        "description": "Analog supply for the ADC, reset block, PLL and oscillators, 2.0-3.6 V. Must be present whenever VDD is powered."
      },
      {
        "number": "10",
        "name": "PA0-WKUP",
        "type": "bidirectional",
        "description": "GPIO PA0 with WKUP wake-from-standby input; alt: USART2_CTS, ADC12_IN0, TIM2_CH1_ETR."
      },
      {
        "number": "11",
        "name": "PA1",
        "type": "bidirectional",
        "description": "GPIO PA1; alt: USART2_RTS, ADC12_IN1, TIM2_CH2."
      },
      {
        "number": "12",
        "name": "PA2",
        "type": "bidirectional",
        "description": "GPIO PA2; alt: USART2_TX, ADC12_IN2, TIM2_CH3."
      },
      {
        "number": "13",
        "name": "PA3",
        "type": "bidirectional",
        "description": "GPIO PA3; alt: USART2_RX, ADC12_IN3, TIM2_CH4."
      },
      {
        "number": "14",
        "name": "PA4",
        "type": "bidirectional",
        "description": "GPIO PA4; alt: SPI1_NSS, USART2_CK, ADC12_IN4."
      },
      {
        "number": "15",
        "name": "PA5",
        "type": "bidirectional",
        "description": "GPIO PA5; alt: SPI1_SCK, ADC12_IN5."
      },
      {
        "number": "16",
        "name": "PA6",
        "type": "bidirectional",
        "description": "GPIO PA6; alt: SPI1_MISO, ADC12_IN6, TIM3_CH1, TIM1_BKIN (remap)."
      },
      {
        "number": "17",
        "name": "PA7",
        "type": "bidirectional",
        "description": "GPIO PA7; alt: SPI1_MOSI, ADC12_IN7, TIM3_CH2, TIM1_CH1N (remap)."
      },
      {
        "number": "18",
        "name": "PB0",
        "type": "bidirectional",
        "description": "GPIO PB0; alt: ADC12_IN8, TIM3_CH3, TIM1_CH2N (remap)."
      },
      {
        "number": "19",
        "name": "PB1",
        "type": "bidirectional",
        "description": "GPIO PB1; alt: ADC12_IN9, TIM3_CH4, TIM1_CH3N (remap)."
      },
      {
        "number": "20",
        "name": "PB2",
        "type": "bidirectional",
        "description": "GPIO PB2 (5 V tolerant), doubles as BOOT1 boot-mode select at reset."
      },
      {
        "number": "21",
        "name": "PB10",
        "type": "bidirectional",
        "description": "GPIO PB10 (5 V tolerant); alt: I2C2_SCL, USART3_TX, TIM2_CH3 (remap)."
      },
      {
        "number": "22",
        "name": "PB11",
        "type": "bidirectional",
        "description": "GPIO PB11 (5 V tolerant); alt: I2C2_SDA, USART3_RX, TIM2_CH4 (remap)."
      },
      {
        "number": "23",
        "name": "VSS_1",
        "type": "power_in",
        "description": "Digital ground return. Tie to system ground."
      },
      {
        "number": "24",
        "name": "VDD_1",
        "type": "power_in",
        "description": "Digital supply 2.0-3.6 V. Decouple locally with a 100 nF capacitor."
      },
      {
        "number": "25",
        "name": "PB12",
        "type": "bidirectional",
        "description": "GPIO PB12 (5 V tolerant); alt: SPI2_NSS, I2C2_SMBAl, USART3_CK, TIM1_BKIN (remap)."
      },
      {
        "number": "26",
        "name": "PB13",
        "type": "bidirectional",
        "description": "GPIO PB13 (5 V tolerant); alt: SPI2_SCK, USART3_CTS, TIM1_CH1N (remap)."
      },
      {
        "number": "27",
        "name": "PB14",
        "type": "bidirectional",
        "description": "GPIO PB14 (5 V tolerant); alt: SPI2_MISO, USART3_RTS, TIM1_CH2N (remap)."
      },
      {
        "number": "28",
        "name": "PB15",
        "type": "bidirectional",
        "description": "GPIO PB15 (5 V tolerant); alt: SPI2_MOSI, TIM1_CH3N (remap)."
      },
      {
        "number": "29",
        "name": "PA8",
        "type": "bidirectional",
        "description": "GPIO PA8 (5 V tolerant); alt: USART1_CK, TIM1_CH1, MCO (main clock output)."
      },
      {
        "number": "30",
        "name": "PA9",
        "type": "bidirectional",
        "description": "GPIO PA9 (5 V tolerant); alt: USART1_TX, TIM1_CH2."
      },
      {
        "number": "31",
        "name": "PA10",
        "type": "bidirectional",
        "description": "GPIO PA10 (5 V tolerant); alt: USART1_RX, TIM1_CH3."
      },
      {
        "number": "32",
        "name": "PA11",
        "type": "bidirectional",
        "description": "GPIO PA11 (5 V tolerant); alt: USART1_CTS, CANRX, USBDM (USB D-), TIM1_CH4."
      },
      {
        "number": "33",
        "name": "PA12",
        "type": "bidirectional",
        "description": "GPIO PA12 (5 V tolerant); alt: USART1_RTS, CANTX, USBDP (USB D+), TIM1_ETR."
      },
      {
        "number": "34",
        "name": "PA13",
        "type": "bidirectional",
        "description": "SWDIO / JTMS after reset (SWD data / JTAG mode select). Usable as GPIO PA13 (5 V tolerant) once debug alternate is disabled."
      },
      {
        "number": "35",
        "name": "VSS_2",
        "type": "power_in",
        "description": "Digital ground return. Tie to system ground."
      },
      {
        "number": "36",
        "name": "VDD_2",
        "type": "power_in",
        "description": "Digital supply 2.0-3.6 V. Decouple locally with a 100 nF capacitor."
      },
      {
        "number": "37",
        "name": "PA14",
        "type": "bidirectional",
        "description": "SWCLK / JTCK after reset (SWD/JTAG clock). Usable as GPIO PA14 (5 V tolerant) once debug alternate is disabled."
      },
      {
        "number": "38",
        "name": "PA15",
        "type": "bidirectional",
        "description": "JTDI after reset. Alt: TIM2_CH1_ETR, SPI1_NSS (remap); usable as GPIO PA15 (5 V tolerant) once JTAG disabled."
      },
      {
        "number": "39",
        "name": "PB3",
        "type": "bidirectional",
        "description": "JTDO / TRACESWO after reset. Alt: TIM2_CH2 (remap), SPI1_SCK (remap); usable as GPIO PB3 (5 V tolerant) once JTAG disabled."
      },
      {
        "number": "40",
        "name": "PB4",
        "type": "bidirectional",
        "description": "NJTRST after reset. Alt: TIM3_CH1 (remap), SPI1_MISO (remap); usable as GPIO PB4 (5 V tolerant) once JTAG disabled."
      },
      {
        "number": "41",
        "name": "PB5",
        "type": "bidirectional",
        "description": "GPIO PB5 (not 5 V tolerant); alt: I2C1_SMBAl, TIM3_CH2 (remap), SPI1_MOSI (remap)."
      },
      {
        "number": "42",
        "name": "PB6",
        "type": "bidirectional",
        "description": "GPIO PB6 (5 V tolerant); alt: I2C1_SCL, TIM4_CH1, USART1_TX (remap)."
      },
      {
        "number": "43",
        "name": "PB7",
        "type": "bidirectional",
        "description": "GPIO PB7 (5 V tolerant); alt: I2C1_SDA, TIM4_CH2, USART1_RX (remap)."
      },
      {
        "number": "44",
        "name": "BOOT0",
        "type": "input",
        "description": "Boot-mode select input sampled at reset with BOOT1 (PB2). Selects boot from Flash, system memory or SRAM."
      },
      {
        "number": "45",
        "name": "PB8",
        "type": "bidirectional",
        "description": "GPIO PB8 (5 V tolerant); alt: I2C1_SCL (remap), TIM4_CH3, CANRX (remap)."
      },
      {
        "number": "46",
        "name": "PB9",
        "type": "bidirectional",
        "description": "GPIO PB9 (5 V tolerant); alt: I2C1_SDA (remap), TIM4_CH4, CANTX (remap)."
      },
      {
        "number": "47",
        "name": "VSS_3",
        "type": "power_in",
        "description": "Digital ground return. Tie to system ground."
      },
      {
        "number": "48",
        "name": "VDD_3",
        "type": "power_in",
        "description": "Digital supply 2.0-3.6 V. Decouple locally with a 100 nF capacitor."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.st.com/resource/en/datasheet/stm32f103cbt6.pdf",
        "pages": 105,
        "sha256": "ceab0f159ae79118",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 48,
        "described": 48,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -4.1625,
        -2.75
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "LQFP-48_7x7mm_P0.5mm@sha256:1ccc5ad4d95398a4",
      "mark": "drawn"
    },
    "mcu": {
      "part_number": "STM32F103CBT6",
      "series": "STM32F1",
      "subfamily": "STM32F103",
      "core": "Arm Cortex-M3",
      "frequency_mhz": 72,
      "flash_kb": 128,
      "ram_kb": 20,
      "io_count": 37,
      "package": "LQFP 48 7x7x1.4 mm",
      "marketing_status": "Active",
      "fpu": null,
      "supply_v_min": 2,
      "supply_v_max": 3.6,
      "temp_min_c": -40,
      "temp_max_c": 85,
      "adc_count": 2,
      "timers": 4,
      "in_distributor_stock": true,
      "product_folder": "/en/microcontrollers-microprocessors/stm32f103cb.html",
      "source": "st.com portfolio grid CL1734"
    },
    "models_3d": [
      {
        "file": "stm32f103cbt6.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9,
          9,
          1.5
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "9dea352d93177c2904afd7d7b68ea8855ce1ab691f69f8b3e13655600514b6bf",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "stm32f103cbt6-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9,
          9,
          1.5
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "3cfed74797f12fcbf52358a6fb7c72fa06ddb048d073071512eaab78ca67fa87",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Core": "Arm Cortex-M3",
      "Max clock": "72 MHz",
      "Flash": "128 kB",
      "RAM": "20 kB",
      "I/O pins": 37,
      "ADC units": 2,
      "ST status": "Active",
      "Manufacturer": "STMicroelectronics",
      "Package": "LQFP-48(7x7)",
      "Category": "MCU",
      "Pins": "48"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "stm32f103cbt6"
  ],
  "discovery_pitch": "STM32F103CBT6 (STMicroelectronics) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "stm32f103cbt6.kicad_sym",
    "stm32f103cbt6.kicad_mod",
    "stm32f103cbt6.glb",
    "stm32f103cbt6.step",
    "stm32f103cbt6-etched.step",
    "stm32f103cbt6.lbr",
    "docs/hero.png",
    "docs/stm32f103cbt6-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "STM32F103CBT6",
      "kind": "packaging"
    },
    {
      "mpn": "STM32F103CBT6CBT7",
      "kind": "packaging"
    },
    {
      "mpn": "STM32F103CBT6CBU6",
      "kind": "packaging"
    },
    {
      "mpn": "STM32F103CBT6TBU6",
      "kind": "packaging"
    },
    {
      "mpn": "STM32F103CBT6RBT6",
      "kind": "packaging"
    },
    {
      "mpn": "STM32F103CBT6RBH6",
      "kind": "packaging"
    },
    {
      "mpn": "STM32F103CBT6VBT6",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-25T08:42:25.794Z"
}